throw (one)
To cause one to be greatly confused, perplexed, or disconcerted; to befuddle or bemuse one. It really threw us when Olivia announced she was leaving the company. His caustic response threw me, as it seemed to come out of nowhere.
throw someone
Cause someone to be confused or perplexed, disconcert someone, as in We didn't let our worries throw us, or That unfavorable review threw her. [Colloquial; mid-1800s] Also see knock for a loop.